Aggregate-free urate oxidase for preparation of non-immunogenic polymer conjugates
First Claim
1. Purified urate oxidase (uricase) that contains no more than about 2% of aggregates larger than octamers, wherein greater than about 20% of said uricase is in the tetrameric or octameric form.
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Abstract
A naturally occurring or recombinant protein, especially a mutein of porcine urate oxidase (uricase), that is essentially free of large aggregates can be rendered substantially non-immunogenic by conjugation with a sufficiently small number of strands of polymer such that the bioactivity of the protein is essentially retained in the conjugate. Such conjugates are unusually well suited for treatment of chronic conditions because they are less likely to induce the formation of antibodies and/or accelerated clearance than are similar conjugates prepared from protein preparations containing traces of large aggregates.
124 Citations
30 Claims
- 1. Purified urate oxidase (uricase) that contains no more than about 2% of aggregates larger than octamers, wherein greater than about 20% of said uricase is in the tetrameric or octameric form.
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28. A purified fragment of uricase that contains no more than about 2% of aggregates larger than octamers, wherein said fragment is a recombinant uricase that has been truncated at the amino terminus, at the carboxyl terminus, or at both the amino and carboxyl termini, and wherein greater than about 20% of said truncated uricase is in the tetrameric or octameric form.
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30. Isolated uricase prepared by a method comprising separating uricase aggregates larger than octamers from uricase tetramers and octamers and excluding such aggregates from the isolated uricase, wherein about 98% to about 100% of said uricase is in the tetrameric or octameric form.
Specification